package com.example.springsecurity.demo.controller;

import com.example.springsecurity.demo.model.ImageCode;
import org.springframework.social.connect.web.HttpSessionSessionStrategy;
import org.springframework.social.connect.web.SessionStrategy;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.ServletWebRequest;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Random;

/**
 * FileName: ValidateCodeController
 * Author:   haichaoyang3
 * Date:     2019/9/18 13:54
 * Description:验证码
 * History:
 * since: 1.0.0
 */
@RestController
public class ValidateCodeController {
    private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();

    public static final String SESSION_KEY="SESSION_KEY_IMAGE_CODE";

    @GetMapping("/code/image")
    public void createCode(HttpServletRequest request, HttpServletResponse response) throws IOException{
        ImageCode imageCode = createImageCode(request);
        sessionStrategy.setAttribute(new ServletWebRequest(request),SESSION_KEY,imageCode);
        ImageIO.write(imageCode.getImage(),"JPEG",response.getOutputStream());
        ImageIO.write(imageCode.getImage(),"JPEG",new File("D:\\test.JPEG"));
    }

    private ImageCode createImageCode(HttpServletRequest request){
        int width = 67;
        int height = 23;
        BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
        Graphics g= image.getGraphics();
        Random random = new Random();
        g.setColor(getRandColor(200,250));
        g.fillRect(0,0,width,height);
        g.setFont(new Font("Times New Roman",Font.ITALIC,20));
        g.setColor(getRandColor(160,200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x,y,x+xl,y+yl);
        }

        String sRand = "";
        for (int i = 0; i < 4; i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand+=rand;
            g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
            g.drawString(rand,13*i+6,16);
        }
        g.dispose();
        return new ImageCode(image,sRand,60);
    }

    private Color getRandColor(int fc,int bc){
        Random random  =new Random();
        if (fc>255)
            fc = 255;
        if (bc>255)
            bc = 255;
        int r= fc+random.nextInt(bc-fc);
        int g= fc+random.nextInt(bc-fc);
        int b= fc+random.nextInt(bc-fc);
        return new Color(r,g,b);
    }



}
